Science

In this Friday, Aug. 16, 2019, photo, chemist David Dawson pours pieces of a cannabis-infused chocolate bar into a vial as he demonstrates testing for THC and other chemicals at CW Analytical Laboratories in Oakland, Calif. Chemists are trying to solve a scientific mystery involving marijuana brownies. Chocolate seems to throw off test results for potency. That could be dangerous for consumers looking to relax, not hallucinate. (AP Photo/Jeff Chiu)

How much marijuana is really in that pot brownie? Chocolate can throw off potency tests so labels aren't always accurate, and now scientists are trying to figure out why. In states where marijuana is legal, pot comes in cookies, mints, gummies, protein bars — even pretzels. These commercial...

This undated photo made available by The Pew Charitable Trusts shows the mako shark swimming in the Atlantic Ocean off Rhode Island. Countries have agreed to protect more than a dozen shark species at risk of extinction, in a move aimed at conserving some of the ocean’s most awe-inspiring creatures who have themselves become prey to commercial fishing and the Chinese appetite for shark fin soup. Three proposals covering the international trade of 18 types of mako sharks, wedgefishes and guitarfishes each passed with a needed two-thirds majority in a committee of the World Wildlife Conference known as CITES on Sunday Aug. 25, 2019. (Matthew D Potenski/The Pew Charitable Trusts via AP)

GENEVA (AP) — Countries have agreed to protect more than a dozen shark species at risk of extinction, in a move aimed at conserving some of the ocean's most awe-inspiring creatures who have themselves become prey to commercial fishing and the Chinese appetite for shark fin soup. Three proposals...

Neri dos Santos Silva, center, is silhouetted against an encroaching fire threat after he spent hours digging trenches to keep the flames from spreading to the farm he works on, in the Nova Santa Helena municipality, in the state of Mato Grosso, Brazil, Friday, Aug. 23, 2019. Under increasing international pressure to contain fires sweeping parts of the Amazon, Brazilian President Jair Bolsonaro on Friday authorized use of the military to battle the massive blazes. (AP Photo/Leo Correa)

RIO DE JANEIRO (AP) — Backed by military aircraft, Brazilian troops on Saturday were deploying in the Amazon to fight fires that have swept the region and prompted anti-government protests as well as an international outcry. President Jair Bolsonaro also tried to temper global concern, saying that...

In this photo taken on Friday, July 26, 2019, and distributed by Roscosmos Space Agency Press Service, the Fedor robot is displayed before being loaded into a Soyuz capsule that was launched Thursday Aug. 22, 2019, from the launch pad at Russia's space facility in Baikonur, Kazakhstan. A Russian space capsule carrying a humanoid robot has failed to dock as planned with the International Space Station. A statement from the Russian space agency Roscosmos said the failure to dock on Saturday Aug. 24, 2019, was because of problems in the docking system, but didn't give details. (Roscosmos Space Agency Press Service photo via AP)

MOSCOW (AP) — A Russian space capsule carrying a humanoid robot has failed to dock as planned with the International Space Station. A statement from the Russian space agency Roscosmos said the failure on Saturday was because of problems in the docking system. It said the space station itself and...

Wildfires consume an area near Porto Velho, Brazil, Friday, Aug. 23, 2019. Brazilian state experts have reported a record of nearly 77,000 wildfires across the country so far this year, up 85% over the same period in 2018. Brazil contains about 60% of the Amazon rainforest, whose degradation could have severe consequences for global climate and rainfall. (AP Photo/Victor R. Caivano)

PORT VELHO, Brazil (AP) — Under international pressure to contain fires sweeping parts of Brazil's Amazon, President Jair Bolsonaro on Friday authorized use of the military to battle the huge blazes while thousands took to the streets to protest his environmental policies. Brazilian forces will...

FILE - In this Saturday, April 28, 2018 file photo, the floating nuclear power plant, the 'Akademik Lomonosov', is towed out of the St. Petersburg shipyard where it was constructed in St. Petersburg, Russia. The Akademik Lomonosov that carries two 35-megawatt nuclear reactors set out Friday Aug. 23, 2019, from the Arctic port of Murmansk on the Kola Peninsula on a three-week journey to Pevek on the Chukotka Peninsula. (AP Photo/Dmitri Lovetsky, File)

MOSCOW (AP) — Russia's first floating nuclear power plant sailed Friday to its destination on the nation's Arctic coast, a project that environmentalists have criticized as unsafe. The Akademik Lomonosov is a 140-meter (459-foot) long towed platform that carries two 35-megawatt nuclear reactors. On...

FILE - This Sunday, Oct. 7, 2018 file photo, shows an entrance to "The State Central Navy Testing Range" near the village of Nyonoksa, northwestern Russia. The Aug. 8, 2019, explosion of a rocket engine at the Russian navy's testing range just outside Nyonoksa led to a brief spike in radiation levels and raised new questions about prospective Russian weapons. Over Russian 100 medical workers who helped treat victims of a recent mysterious explosion at a military testing range have undergone checks and one man has been found with a trace of radiation, officials said Friday Aug. 23, 2019. (AP Photo/Sergei Yakovlev, File)

MOSCOW (AP) — More than Russian 100 medical workers who helped treat victims of a recent mysterious explosion at a military testing range have undergone checks and one man has been found with a trace of radiation, officials said Friday. The Aug. 8 incident at the Russian navy's range in Nyonoksa on...

This satellite image provided by NASA shows the fires in Brazil on Aug. 20, 2019. As fires raged in the Amazon rainforest, the Brazilian government on Thursday denounced international critics who say President Jair Bolsonaro is not doing. (NASA via AP)

RIO DE JANEIRO (AP) — Amid global concern about raging fires in the Amazon, Brazil's government complained Thursday that it is being targeted in smear campaign by critics who contend President Jair Bolsonaro is not doing enough to curb widespread deforestation. The threat to what some call "the...

PASADENA, Calif. (AP) — There is now a "Rolling Stones Rock" on Mars, and it's giving Mick, Keith and the boys some serious satisfaction. NASA named a little stone for the legendary rockers after its InSight robotic lander captured it rolling across the surface of Mars last year, and the new...